So I am new to investing in Legos, and I only just remembered a few bionicles I got when i was much younger that were collecting dust up in my room. I never opened them since I was really more of a star wars guy, but now I am hoping to sell them. Unfortunately, I've never sold anything online before and I can't find any completed listings on ebay that are like what I have so I was hoping someone here could help me out. I have 3 bionicles, namely 8589, 8588, and 8592 all factory sealed in perfect condition aside from a little dust haha. They look like they might be worth something like 8-15 each, but would it be better to sell all three at the same time? And if so for around what price? Any advice or recommendations you guys can give me would be much appreciated, thanks in advance.

Selling separately brings more money usually.